Butterfly Sensor With Rev K Version

- Masimo SpHb™ continuous hemoglobin monitoring The Masimo SpHb™ monitor with the
Butterfly Sensor with RevK version will be used to continuously monitor hemoglobin
electronically. The Butterfly Sensor will be connected to the 3rd or 4th finger on
either the right or left hand.

- Masimo Pronto-7™ intermittent hemoglobin monitoring The Masimo Pronto-7™ is a
hand-held, noninvasive device used for intermittent measuring of blood hemoglobin. The
device is connected to a re-usable sensor which is clipped onto a finger for quick
spot-check readings. A reading from the Pronto-7 will be taken immediately before
surgery.

- Blood sampling for hemoglobin determination For the study, about a ½ tsp of blood will
be collected from the arterial line placed for the purpose of surgery approximately
every hour during the surgery to obtain a hemoglobin measurement to be analyzed in the
UCSF Clinical Lab.

Inclusion Criteria:

- Male of non-pregnant female 18 y/o or older

- American Society of Anesthesiologists Classification 1,2 or 3

- Scheduled to undergo spine or hip surgery

Exclusion Criteria:

- Pregnant or nursing

- Patients who in the investigators clinical judgement would not be suitable for
research